Study on viscosity contrast between majorite and ringwoodite

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In order to study viscous behavior of the deep Earth materials, experimental techniques on deformation experiment and stress measurement under high-temperature and high-pressure were developed. An experimental study using the developed technique revealed that the activation volume of the low-temperature rheology of olivine has positive value, and this suggests that viscous resistance by subducting slab increases with increasing depth. On the other hand, a preliminary study on mechanism of the decompression-decomposition reaction of majorite showed that the reaction starts with formation of garnet and clinopyroxene with disequilibrium compositions followed by chemical diffusion in garnet.